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" n. GUMMING, Jr; METHOD 0F LOCKING NUTS.A

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Leners Patent No. 78,864, dated June Ie, 186s.

IMPROVEMENT IN METHOD OE LOGKINGNUTS.

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TO ALL WHOM IT MAY CONCERN:

Be it known thatI, DAVID OUMMING, Jr., of New York, county and State of.New York, have inv'entedel new and useful Improvement in Slcrew-Bo1tsandI do hereby declare that the following is a full, clear, and exactdescription of the construction and operation of the same, referencebeing had to the annexed drawings, makinga part of this specification,in which- Figure 1 is a perspectiveyiew, Y

Figure 2 a longitudinal section, and

Figure 3 a transverse section. v

The same letters refer to corresponding parts in the different igures.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

A is a screw-bolt, of the usual form, in the threaded part of which Icut a key-seat, into which I insert the key-C, which I make of lead orother soft metal.

The'nut B, which is-of the usual form, is then" screwed on, the threadof the nut cutting a corresponding thread on the key. When the nut isscrewed up to its place, that portion ofthe key X which is outside ofthe nut, is to be riveted up against the nut, destroying the thread onthat portion of the key. The nut cannot then come oit' until force isused, as the nut has to cut the thread again on the'key in comingback,-and the key cannot get out of its seat until the nut is taken off,thereby'preventng the nut from being shaken o as is frequently the casewhere screw-bolts are used in the construction of railroadecars,carriages, bridges, and other structures.

I do not confine myself` to the use of lead, as any soft metal,material, or composition can be used for making the keys.

I am aware that nuts have been prevented from tu'rn'ing by ine-'ms 0f0.- key, 0f ironyor other hard metal, inserted in a key-seat, c'ut inthe threaded part of the bolt; butA this I do not claim.

What I do claim, and desire to secure by Letters Patent, is-

The key, of lead or other similar soft metal, when constructed andapplied substantiallyV as herein described and for the purpose setforth.

DAVID CUMMING, JR.

Witnesses:

WILLIAM S. PRICE, CHARLES MEI'TNER,

